First Version

.gitignore

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+*.o
+dnsseed*
+dnsstats.log

Makefile

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+CXXFLAGS = -O3 -g0 -march=native
+LDFLAGS = $(CXXFLAGS)
+
+dnsseed: dns.o bitcoin.o netbase.o protocol.o db.o main.o util.o
+	g++ -pthread $(LDFLAGS) -o dnsseed dns.o bitcoin.o netbase.o protocol.o db.o main.o util.o -lcrypto
+
+%.o: %.cpp bitcoin.h netbase.h protocol.h db.h serialize.h uint256.h util.h
+	g++ -std=c++11 -pthread $(CXXFLAGS) -Wall -Wno-unused -Wno-sign-compare -Wno-reorder -Wno-comment -c -o $@ $<
+
+dns.o: dns.c
+	gcc -pthread -std=c99 $(CXXFLAGS) dns.c -Wall -c -o dns.o
+
+%.o: %.cpp

README

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+reex-seeder
+==============
+
+Reex-seeder is a crawler for the Reex network, which exposes a list
+of reliable nodes via a built-in DNS server.
+
+Features:
+* regularly revisits known nodes to check their availability
+* bans nodes after enough failures, or bad behaviour
+* accepts nodes down to v0.1.0 to request new IP addresses from,
+  but only reports good post-v0.1.0 nodes.
+* keeps statistics over (exponential) windows of 2 hours, 8 hours,
+  1 day and 1 week, to base decisions on.
+* very low memory (a few tens of megabytes) and cpu requirements.
+* crawlers run in parallel (by default 24 threads simultaneously).
+
+REQUIREMENTS
+------------
+
+$ sudo apt-get install build-essential libboost-all-dev libssl-dev -y
+
+USAGE
+-----
+
+Assuming you want to run a dns seed on dnsseed.example.com, you will
+need an authorative NS record in example.com's domain record, pointing
+to for example vps.example.com:
+
+$ dig -t NS dnsseed.example.com
+
+;; ANSWER SECTION
+dnsseed.example.com.   86400    IN      NS     vps.example.com.
+
+On the system vps.example.com, you can now run dnsseed:
+
+./dnsseed -h dnsseed.example.com -n vps.example.com
+
+If you want the DNS server to report SOA records, please provide an
+e-mail address (with the @ part replaced by .) using -m.
+
+COMPILING
+---------
+Compiling will require boost and ssl.  On debian systems, these are provided
+by `libboost-dev` and `libssl-dev` respectively.
+
+$ make
+
+This will produce the `dnsseed` binary.
+
+
+RUNNING AS NON-ROOT
+-------------------
+
+Typically, you'll need root privileges to listen to port 53 (name service).
+
+One solution is using an iptables rule (Linux only) to redirect it to
+a non-privileged port:
+
+$ iptables -t nat -A PREROUTING -p udp --dport 53 -j REDIRECT --to-port 5353
+
+If properly configured, this will allow you to run dnsseed in userspace, using
+the -p 5353 option.